I,M 45 A VERY FIT 45. I USE THE GRAVITY BOOTS AT THE END OF MY WORK OUT, I WILL DO AT LEAST A TOTAL OF 400 AB- CRUNCHES AND ABOUT 200 TWISTING STRECTHES. NOW THIS IS AFTER I DO ALL MY OTHER EXERCISES THAT CONSIST OF 15 DIFFERENT TYPES AND ALSO ADOMINAL EXERCISES AS WELL, PLUS THE TREADMIL AND STRECTHING AT THE BEGINNING AS A WARM UP. MY BACK AND STOMACH HAVE NEVER FELT AS GOOD AS TEHY DO KNOW, IT FEELS GREAT TO JUST HANG UP-SIDE DOWN. YOU CAN FEEL IT STECTHING YOUR SPINE, AND I,M SURE THAT THE BLOOD BEING FORCED INTO YOUR HEAD HAS TO BE GOOD FOR YOU. AFTER ALL, HOW OFTEN DOES THAT MUCH BLOOD GET PUMPED UP THERE, THERE HAS TO BE SOME GOOD SIDE AFFECTS FROM THIS.

These came in the mail on a Friday and I was throwing a party that night. I had them on my counter and of course someone asked about them. Inevitably 4 for my guests went upside down that night and we all had a good time watching... Next party we are going to try the monkey chug using them!!!